/Engine/Source/Runtime/InteractiveToolsFramework/Public/InteractiveToolObjects.h
AInternalToolFrameworkActoris a base class for internal Actors that the ToolsFramework may spawn (for gizmos, mesh previews, etc). These Actors may need special-case handling, for example to prevent the user from selecting and deleting them.
class AInternalToolFrameworkActor : public [AActor](API\Runtime\Engine\GameFramework\AActor)
bool
bIsSelectableInEditor
Controls whether this InternalToolFrameworkActor can be selected in the Editor.